Do petal length and width differ significantly in different types of irises?
2019-08-20
Do petal length and width differ significantly in different types of irises?
We use the iris dataset (built into R) to explore this question:
## Measurements: names(iris)
## [1] "Sepal.Length" "Sepal.Width" "Petal.Length" "Petal.Width" ## [5] "Species"
## Species sampled: levels(iris$Species)
## [1] "setosa" "versicolor" "virginica"
We use the plotly package to easily generate an interactive plot that enables us to explore our central question:
p <- plot_ly(iris,
x = ~Petal.Length, y = ~Petal.Width,
type = 'scatter', mode = 'markers',
color = ~Species)
There is noticeable separation between the setosa cluster and the other two iris types, in terms of petal length and width.
There is a small amount of overlap between the versicolor and virginica clusters.
It is plausible that the petal length and width differ significantly for the three types of irises, but this result has not been shown statistically.